1. An adjective used to show how you damn good you think something is.
2. The opposite of a bad ass; a non-violet, level-headed young person.
3. A particularly finebottom.

1. "This is a good ass piece of cheese!"
2. "Look at that guy, studying when he could be could be doing semi-illegal things! Pah, what a good ass!"
3. "You see that girl? I think she has a really good ass!"